The comp.lang.lispFAQ list,
as well as the old
list, also at
CMU, (no longer maintained, but may be an important source of
information still).

CLiki - intends to provide
a collection of links to and resources for free software implemented in
Common Lisp and available on Unix-like systems.

The Common Lisp Directory
is intended to be a resource for Common Lisp users who are invited to
post mostly Lisp related links into the LinkIt section and use/comment
the Directory and Knowledge Base in the Directory section.

CLORB is an Object Request Broker implementing
CORBA 2. It currently supports
DII, DSI and the POA. The goal is to make the mapping follow the
proposed mapping for LISP, but currently this is only half done.

a system implemented in Common Lisp for generating dynamic HTML
from scripted pages.

JACOL - A framework for bidirectional Java and Common Lisp
interoperability
[projecthome]

JACOL is a framework for allowing Java and Common Lisp to
inter-operate. Its intended use is to enable Common Lisp to
function as an extension language for Java.
It can also be used to expose Java APIs (such as Swing and DOM) to
Lisp applications.

Maxima is a fairly complete computer algebra system written in
lisp with an emphasis on symbolic computation.
It is based on DOE-MACSYMA and licensed under the GPL.
Its abilities include symbolic integration, 3D plotting, and an ODE
solver.

A compiler that connects C and C++ with a variety of scripting languages.
Note that CLISP FFI
is much more expressive than the C headers, so the CLISP FFI forms
generated by SWIG will certainly need tweaking before being useful.